Mold-form.



P. CLAWSON.

MOLD FORM.

APPLICATlON HLED OCT. z, 1915.

' Patented Jan. 11, 1916.

Witness:

Attorney ing is a specification.

UNITED sra'rns PATENT PERRY CLAWSON, OF HAMILTON, OHIO.

MOLD-FORM.

Application filed October 7, 1915.

To all whom it may concern:

Be it known that I, PERRY CLAwsoN, a citizen of the United States, residing at Hamilton, Butler county, Ohio, have invented certain new and useful Improvements in Mold-Forms. of which the follow- The present invention has reference to the V construction of mold-forms adapted for use improved mold-form is of high utility in the formation of these hoops and permits of ready adgustme'nt for diameter of the hoops. Again, assume that a "cement or concrete structure is to'be molded upon a cylindrical core. My improved mold-form ofiers special facilities for building upsuch a core andfor providing for its selected diameter. Again, assume that a concrete arch is to be built over a centering form. My inold-form provides for the convenient construction or" such a centering form for a circular arch of selected radius or for an arch of elliptic or other form involving a diversity of radii.

My invention will be readily understood from the. following description taken in connection with the accompanying drawing in which:- I

Figure 1 is a perspective view of a mold- -form exemplifying my invention, this view illustrating the form in'normal straight condition. Fig. 2 a plan ofthe form when put into curved condition: Fig. 3 a plan of several of the forms put into curved conditionand united to constitute a cylindrical core: Fig. 4 an elevation of one of the laminated wooden reinforcements: Fig. 5 a plan of this reinforcement: Fig. 6 a plan of a substantially rigid reinforcement; Fig. 7 an elevation of a number of the forms so united as to constitute centering for an elliptic or non-circular arch; 8 an elevation of thev end; portions of twoof the forms united by Specification of Letters Yatent.

Patented Jan. 13, 1553.5.

Serial No. 54,496.

means of their end accessories: and Fig. 9 an elevation of the end portions 01 four of the forms united by their end accessories.

A. diversity of scales is employed in the drawing.

In the drawing: 1, indicates a straightstrip of flexible material. preferably of spring-tempered steel angle-plates firmly secured at each end of one face of the flexible strip: 3, those members of the anglc plates which project at right angles front the face of the flexible strip and have a width corresponding with the width of the strip: 4, those members of the angle-plates which lie against the flexible strip: 5, bolts passing through the flexible strip and through the angle-members 4; and serving to rigidly secure the angle-plates to the strip: 6, bolt-holes in the members of the angle-plates: 7, a perforated web formed with and connecting the member-s3 and s of each angle-plate: and S, a turnbuckle having its ends engaging the web 7 and serving as a means by which the two angle-plates may be drawn toward each. other and a curvature given to the flexible strip.

Theidimensions of the fiexible,strip will be in accordance with the general dimen sions of the work to be produced on the mold-form and there are to be a number a the mold-forms capable of being united, the

forms being of similar or dissimilar size.

the rods of the turnbuckle are hooked into apertures in web '7 and are preferably secured in the apertures by nuts on the hooking ends of the.turnbucl:le.= rods.

Normally, the niold-torin illustrated in Fig. 1, is'straight. Assume that a cylindrical core iswanted, around which are to be constructed'larninated wooden hoops for SllO purposes, or around. which cement or concrete is to be molded. propernumber of the mold-forms may begiven a curvature by operating their turnbuckles, thus pro- 'ducing curved segments, any desired degree ofcurvature being given to the segments.

These'se ments may then be bolted together endwise y bolts through bolt-holes 6, thus cbnstituting a complete circular form, as in- .dicatcd in Fig. 3 Where eight of the segmental forms are shown in association. As

it may be that no selected number of mold conditions of use of the. forms call for a greater degree of stiffness for the strips. I

be of rigid material, as metal properly formed and of suflicient stiffness to retain its form. With such a reinforcement substituted for the laminated reinforcement 9 illustrated in Fig. 2, an individualmoldform may have its flexible strip given a definite 'curvature having a diversity of radii.

' In employing the mold-form when the I by means of flexible strips secured together provide for this superior stiffness by'means of laminated reinforcements 9, as illustrated in' Figs. 2, 4 and 5 These reinforcements may consist of two or more layers offlexible wood secured to each other ,at one of their ends,the ends of these reinforcements abut-- ting against the inner edges of members 4 of the angle-plates. The laminations of these reinforcements being secured to each other at one end only permits of the-layers creeping withrefe'rence to each other while they are being adjusted to curvature; In Fig. 7 there is illustrated a built-up form, suited for an arch. whose curve is struck from a diversity of centers. illustration shows the complete arch form as being composed of four of the improved mold-forms. It is to be noted that two central mold-forms are curved to a certain radius while the two end mold-forms are curved toa lesser radius. \Vhen the arch has been molded then the general form can be, contracted by decreasing the radius of all .or selected ones of the.component moldforms.-in an obvious manner.

When a. given individual mold-form is taken in hand and its turnbuckle adjusted to curve the flexible strip, that strip will in I practice he found to curve toan approximately true circular arc.

In some cases it may be that the are represented by an ml .jdividual mold-form is to have different degrecs of curvature at different pointsinits length, This cannot be accurately accom- The plishcd by the iuer curving of the'flexible strip, nor can it be accomplished when the laminated flexible reinforcementis em- But a solld and substantially in" ployed. I flexible reinforcement may be employed against the inner surface of the flexible Strip and this inflexible reinforcement may have a ;permancnt.form to control the flexible stripof the mold-form;

For instance, 10 illustrates, in plan, a reinforcement which is; to

edgewise. In such case the plan indicated in Fig. 8 may be followed. The angle-plates 2 are not associated entirely with individual flexible strips 1, but each angle-plate is seof any desired depth, may be builtup, the

circumferential joints coming at the same points precisely as though the mold-forms through bolt-holes 6 being depended ,upon to unite the segmental mold-forms. In other cases it may be desired, not-only to bind the segments together widthwise by securing-the individual mold-forms together by the same system of bolting as is employed in securing the angle-plates tothe flexible strips, but also to bind the segments together endwise by the same means. Thus, in Fig. 9, the more extended surfaces 2 of the angle-plates are bolted to the flexible strips and each angle-plate engages a pair of the flexible strips and also the pair of strips adjacent to it in the widthwise direction;

It might here be explained that bolts 5, uniting the angle-plates to the flexible strip, have conical heads flush with the exterior surface of the flexible strip,- and that as the metal of the flexible strip will generally be too thin to accommodate the depth of the into which the turnbucklemaybe hitched.

For a'certain degree of curvature the turnbuckle may be hooked into the holes'farthest from the flexible strip and the range of adjustmentof the turnbuckle may effect the desired degree of curvature of the flexible strip. But, under some, circumstances, the range of the turnbuckle may be exhausted before the desired degree of curvature the plurality of holes in the webs of the -were not connected widtlnvise, the bolts o,f the flexible strip is effected, in which case duced without the reinforcement.

angle-plates permits of the substitution of a shorter turnbuckle to increase the curvature of the strip. or to act as a lixed link in maintaining'the curvature of the strip when the first turnbuckle is removed. Again, regardless of the emplovment of the turnbuckle as a specific means for curving the flexible strip, the flexible strip may be given reinforcement. such as is illustrated in Fig.1

(3, may be employed in. giving to the flexible strip a curvature representing a diversity of radii. a diversity of radii may be'p10 For instance, looking at Fig. 1, if the right-hand end of the turnbuckle. before the turnbuckle is operated, be hooked into the hole nearer the flexible strip, the strip, instead of curving on a substantially circular arc, will have its curvature more decided at its lefthand end. Such variation in the curvature of the flexible strip is not under such perfect control as would be the case if a rigid reinforcement, such as is illustrated in Fig. 6, were employed, but it will be found useful and adequate in many cases of employment of the mold-form. And this consideration at)- plies qnite regardless of whether or not the turnbuckle be employed as the means for drawing the angle-plates: toward each other. Forinstance, assume that the flexible strip be irregularly flexed by means of the turnbuckle engaging the outer hole in one of the webs and the inner hole in the other web, or assume that the flexible strip has been put into this condition of irregular flexation by any means whatever, if a link of proper fixed length has one of its ends hooked into the inner hole of one of the webs and its opposite end hooked into the outer hole of the other web, the flexible strip will become fixed at the proper irregular degree of curvature.

I claim l. A mold-form comprising, a straight strip of flexible material, angle-plates bolted to the opposite ends of one surface of said strip having a flange projecting at right angles therefrom and provided with boltholes to permit the employment of bolts for securing the angle-plate at one end of said strip to a similar angle-plate on the end of a similar strip, and means .connected with said angle-plates and adapted to serve influence of the turnbuckle or,

in drawing the angle-plates toward each other and curving said flexible strip, combined substantially as setforth.

2. A mold-form comprising, a straight strip of flexible material, angle-plates bolted to the opposite ends of one surface of said strip having a flange projecting at rightangles therefrom and provided with boltholes to permit the employment of bolts for securing the angle-plate at one end of said strip to a similar angle-plate on the end of'a similar strip, and a turnbuckle having its opposite ends connected with said angle-plates and adaptecLto serve in drawing the angle-plates toward each other and curving said flexible strip, combined substantially as set forth.

3. A mold-form comprising,- a straight strip of flexible material, angle-plates bolted to the opposite ends of one surface of said strip having a flange projecting at right angles therefrom and providedwith boltholes to permit the employment of bolts for securing the angle-plate at one end of said strip to a similar angle-plate on the end of a similar strip, a reinforcing strip separate from said flexible strip disposed against the surface of the flexible strip bearing the angle-plates, abutments carried by the flel'iin.

ble strip and adapted to engage the ends of said reinforcement, and means connected with said angle-plates and adapted to serve in drawing the angle-plates toward each other andcurving said flexible strip, combined substantially as set forth.

4. A mold-form comprising, a straight strip of flexible material, angle-plates bolted to the opposite ends'of one surface of said strip having a flange projecting at right angles therefrom and provided with boltholes to permit the employment of bolts for securingv the angle-plate at one end of said strip to a similar angle-platoon the end of a similar strip, a laminated reinforcing strip separate from said flexible strip disposed against the surface of the flexible strip bearing the angle-plates, abutments carried by the flexible strip and adapted to engage the ends of said reinforcement, and

means connected Withsaid angle-plates and adapted to serve in drawing the angle-plates toward each other and curving said flexible strip, combined substantially as set forth.

5. A mold-form comprising, a straight strip 'of flexible material, bolted to the opposite ends of one surface of said strip having a flange projecting at right angles therefromand provided with angle plat-es r 120 bolt-holes to permit the employment of bolts for securing the angle-plate at one "end of.v

said strip to a similar angle-plate on the end of a similar strip, a laminated reinforcing strip separate from said flexible strip disposed against the surface of the flexible strip meme-p bolted to the a'ngle-piate at one end of a serve in drawing the angle-plates toward similar strip. a web joining said two memeach other and irregularly cursing the flexibers of each Angie-plate and iisposed at his strip,combineeflsubstantialiyas set forth. rig 'l' lt angles to said mempers and t9 said PERRY CLAWSON fiexlble stnp and provlded with attachmg means at :1 diversity of distances from the strip, and means adapted for cbnnection with ihe attaching means 01 saidWe-bs to Witnesses H. M. MILDERS, GEO. JOHNSON.

Copies of this patent may be ab mined f0: five Eents each, by addressing the Commissioner of Patents.

Washing'ten, D. 0. 

